The rock cycle. The Earth's internal energy.

http://www.bbc.co.uk/bitesize/ks3/science/environment_earth_universe/rock_cycle/activity/








Click on this link

 http://portal.ced.junta-andalucia.es/educacion/webportal/web/aicle/contenidos/

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  Earth's internal energy. Curso: 2º ESO


Read the pages5, 6 and 7.